"Take that, Darth Vader!" Cruz Fino, Jr., 14, pretends to be a starship commander as he shows how an arcade game of the future might look. A player would sit inside a mini-dome. The player would shoot laser beams at video targets projected onto the wall. Though bright, the beams would of course be of low power and harmless. Cruz, whose father is a technician with Laser Images, Inc., lives in Van Nuys, California.